When to lower phosphate levels during flowering?

I know I read it somewhere or I heard it on the grow report - that sometime during the latter part of the flowering period that one should cut out the phophorus (even thought the plants still crave it). I can't remember the specifics so, if anyone knows, can you tell me when exactly do I stop giving my plants phosphorus. When I did a search, all I could find was eliminating nitrogn feedings during the last two weeks but nothing on phosphorus.

I've never heard of this. You must be thinking about nitrogen. If anything you boost phosphorous.